<%= form_for([@post, @post.comments.build]) do |f| %>
    <div class="field">
        <%= f.label :commenter %><br />
        <%= f.text_field :commenter %>
    </div>
    <div class="field">
        <%= f.label :body %><br />
        <%= f.text_area :body %>
    </div>
    <div class="actions">
        <%= f.submit %>
    </div>
<% end %>